21299d4e00
We want to remove energy_ entirely as we've seen that carrying around this potentially invalid value is dangerous. Results in the removal of AudioBuffer::is_muted(). This wasn't used in practice any longer, after the level calculation moved directly to channel.cc Instead, now use ProcessMuted() in channel.cc, to shortcut the level computation when the signal is muted. BUG=3315 TESTED=Muting the channel in voe_cmd_test results in rms=127. R=bjornv@webrtc.org, kwiberg@webrtc.org Review URL: https://webrtc-codereview.appspot.com/12529004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@6159 4adac7df-926f-26a2-2b94-8c16560cd09d
62 lines
1.4 KiB
C++
62 lines
1.4 KiB
C++
/*
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* Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/modules/audio_processing/rms_level.h"
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#include <assert.h>
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#include <math.h>
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namespace webrtc {
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static const float kMaxSquaredLevel = 32768 * 32768;
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RMSLevel::RMSLevel()
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: sum_square_(0),
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sample_count_(0) {}
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RMSLevel::~RMSLevel() {}
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void RMSLevel::Reset() {
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sum_square_ = 0;
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sample_count_ = 0;
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}
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void RMSLevel::Process(const int16_t* data, int length) {
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for (int i = 0; i < length; ++i) {
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sum_square_ += data[i] * data[i];
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}
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sample_count_ += length;
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}
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void RMSLevel::ProcessMuted(int length) {
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sample_count_ += length;
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}
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int RMSLevel::RMS() {
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if (sample_count_ == 0 || sum_square_ == 0) {
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Reset();
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return kMinLevel;
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}
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// Normalize by the max level.
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float rms = sum_square_ / (sample_count_ * kMaxSquaredLevel);
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// 20log_10(x^0.5) = 10log_10(x)
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rms = 10 * log10(rms);
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assert(rms <= 0);
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if (rms < -kMinLevel)
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rms = -kMinLevel;
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rms = -rms;
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Reset();
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return static_cast<int>(rms + 0.5);
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}
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} // namespace webrtc
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